"Americans ... might come here two or three times a year so they are always looking for something new and they have a good knowledge of London," he adds.

Mayor of London Boris Johnson last month announced a £2 million international marketing campaign to boost the number of international visitors coming to London attractions.

Entitles Only in London, it will focus on the unique and exceptional experiences, sights and attractions on offer in the capital.

American tourists in London can make their dollars go further while in the UK with a London Pass.

Related articles

Follow The London Pass blog to learn about the latest news with attractions, sights and sightseeing events in the city. As well as useful tips, hints and advice for visitors to the city and how to make the most of your sightseeing time in London. We hope you enjoy…